End connecting structure for hydraulic valve and hydraulic valve
By introducing a locking nut and internal thread structure between the displacement sensor and the end cap of the hydraulic valve, the problems of unstable connection and poor sealing are solved, achieving higher measurement accuracy and reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-07
- Publication Date
- 2026-03-06
AI Technical Summary
The displacement sensor connection of the existing hydraulic valve is not stable and is easily affected by vibration, which leads to a decrease in measurement accuracy and poor sealing, posing a risk of fluid leakage.
The end connection structure adopts a locking nut and a threaded connection between the connecting section and the end cap. By tightening the locking nut, it is pressed against the end cap, which enhances the connection stability. The internal thread and sealing structure prevent loosening and leakage.
This improved the measurement accuracy of the displacement sensor, enhanced the operational reliability and sealing of the hydraulic valve, and reduced the impact of vibration on the connection.
Smart Images
Figure CN223975638U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of hydraulic component technology, specifically to an end connection structure for a hydraulic valve and a hydraulic valve. Background Technology
[0002] Hydraulic valves are key components in hydraulic systems, primarily used to control the flow direction, pressure, and flow rate of fluids. The performance and reliability of hydraulic valves directly affect the efficiency and safety of the entire hydraulic system. A typical hydraulic valve includes a valve body with a chamber, an end cap at one end of the valve body, a valve core within the chamber, and a displacement sensor on the end cap. When fluid flows into the chamber, it drives the valve core to slide relative to the valve body. The displacement sensor detects the amount of displacement of the valve core, enabling precise control of the hydraulic system and providing early warning of faults.
[0003] In related technologies, displacement sensors are typically screwed directly onto the end cap via their outer housing threads. This connection method suffers from problems such as unstable connection and susceptibility to vibration. When the displacement sensor becomes loose relative to the end cap, its measurement accuracy decreases. Furthermore, while related technologies may use threaded holes on the end cap for this threaded connection, poor sealing may still occur between the displacement sensor's outer housing and the end cap's threaded holes (especially when the sensor becomes loose relative to the end cap). Under high internal valve body pressure, fluid may leak along these threaded holes. Utility Model Content
[0004] This application aims to address one of the technical problems in the related art to a certain extent. To this end, this application provides an end connection structure for a hydraulic valve and a hydraulic valve itself.
[0005] To achieve the above objectives, this application adopts the following technical solution: an end connection structure for a hydraulic valve, the end connection structure comprising:
[0006] End cap, which is used to securely mount to the valve body of the hydraulic valve;
[0007] A displacement sensor has a housing, the housing including a body section and a connecting section with external threads, the displacement sensor being threadedly connected to an end cap via the connecting section; and...
[0008] A locking nut is threadedly connected to the connecting section, and the locking nut is located between the body section and the end cap;
[0009] The locking nut is configured to move to abut against the end cap by a screwing action when the connecting section is tightened to the end cap.
[0010] The application of this application has the following beneficial effects: By adding a locking nut to the connecting section, when the connecting section is tightened to the end cover, the locking nut can be tightened against the end cover, thus improving the axial stability of the connecting section relative to the end cover, reducing the impact of hydraulic valve vibration on the connection stability between the connecting section and the end cover, and preventing loosening of the connecting section relative to the end cover. Therefore, the measurement accuracy of the displacement sensor can be improved, and the operational reliability of the hydraulic valve can be enhanced.
[0011] Optionally, the end cap has a through hole, and the inner wall of the through hole has internal threads. The connecting segment is fixedly connected to the internal threads on the inner wall of the through hole via its external threads. The internal threads on the inner wall of the through hole prevent the connecting segment from being screwed further into the through hole when it reaches the edge of the internal threads, thereby further improving the stability of the connecting segment relative to the end cap along its axial direction.
[0012] Optionally, the connecting segment includes a first cylindrical segment formed on the body segment and a second cylindrical segment formed on the first cylindrical segment, wherein the outer diameter of the second cylindrical segment is smaller than the outer diameter of the first cylindrical segment and the two are coaxial; the external thread of the connecting segment is formed outside the first cylindrical segment, and the connecting segment is connected to the through-hole thread through the first cylindrical segment.
[0013] Optionally, a first sealing structure is provided between the second cylindrical section and the inner wall of the perforation. The first sealing structure is used to prevent fluid inside the valve body of the hydraulic valve from overflowing through the perforation.
[0014] Optionally, the first sealing structure includes a first annular groove disposed on the inner wall of the perforation and a first sealing ring disposed within the first annular groove, the first sealing ring being clamped between the bottom wall of the first annular groove and the second cylindrical section; and / or, the first sealing structure includes a second annular groove disposed on the second cylindrical section and a second sealing ring disposed within the second annular groove, the second sealing ring being clamped between the bottom wall of the second annular groove and the inner wall of the perforation. By providing the first sealing ring and / or the second sealing ring, the sealing performance between the connecting section and the perforation can be improved, preventing fluid leakage inside the valve body; on the other hand, the friction between the connecting section and the perforation can be increased, thereby further preventing the connecting section from loosening relative to the end cap.
[0015] Optionally, the end connection structure further includes an elastic washer sleeved outside the connecting section, and the elastic washer is located between the lock nut and the end cap. The elastic washer can promptly replenish stress when the lock nut experiences stress relaxation relative to the connecting section, preventing the lock nut from loosening, thereby further improving the connection stability between the connecting section and the end cap.
[0016] Optionally, the end connection structure further includes an elastic element disposed between the body section and the locking nut. The elastic element applies pressure to the locking nut, causing it to tend to move closer to the end cap. Similarly, the elastic element can promptly replenish stress when stress relaxation occurs between the locking nut and the connection section, preventing the locking nut from loosening and further improving the connection stability between the connection section and the end cap.
[0017] Optionally, the elastic element is a compression spring sleeved outside the connecting section, with both ends of the compression spring pressing against the main body and the locking nut, respectively.
[0018] Furthermore, this application also provides a hydraulic valve, including a valve body having an inner cavity and a connecting hole communicating with the outside. The hydraulic valve further includes an end connection structure as described in any of the above technical solutions, wherein the end cap is fixedly installed on the valve body and seals the connecting hole. The beneficial effects of the hydraulic valve provided in this application are similar to those of the aforementioned end connection structure, and will not be repeated here.
[0019] Optionally, the outer surface of the end cap is provided with an external thread, the inner wall of the connecting hole is provided with an internal thread, the end cap is fixedly connected to the internal thread on the inner wall of the connecting hole through its external thread, and a third sealing ring is provided between the part of the end cap extending into the connecting hole and the inner wall of the connecting hole.
[0020] These features and advantages of this application will be disclosed in detail in the following specific embodiments and accompanying drawings. The best embodiments or means of this application will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of this application. In addition, each of these features, elements and components appearing in the following text and drawings is multiple and is labeled with different symbols or numbers for convenience, but all represent parts with the same or similar structure or function. Attached Figure Description
[0021] The following description, in conjunction with the accompanying drawings, further illustrates this application:
[0022] Figure 1 This is a schematic diagram of an end connection structure for a hydraulic valve provided in Embodiment 1 of this application;
[0023] Figure 2 An exploded view of the end connection structure provided in the embodiment;
[0024] Figure 3 A cross-sectional view of the end connection structure provided in the embodiment;
[0025] Figure 4 A schematic diagram of the hydraulic valve with the end connection structure provided in Application Embodiment 1;
[0026] Figure 5 A cross-sectional view of the end connection structure provided in Embodiment 2;
[0027] Figure 6 A cross-sectional view of the end connection structure provided in Embodiment 3.
[0028] Among them, 1. End cap; 10. Perforation; 2. Displacement sensor; 20. Housing; 200. Body section; 201. Connecting section; 2010. First cylinder section; 2011. Second cylinder section; 3. Locking nut; 4. First sealing ring; 5. Second sealing ring; 6. Elastic washer; 7. Elastic element; 8. Valve body; 9. Third sealing ring. Detailed Implementation
[0029] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this application and should not be construed as limiting it.
[0030] The terms "an embodiment," "example," or "example" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this application. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.
[0031] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.
[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0033] Example 1: This example provides an end connection structure for a hydraulic valve, such as... Figure 1 and Figure 2As shown, the end connection structure includes an end cap 1, a displacement sensor 2, and a locking nut 3. The end cap 1 is used to fix the sensor to the valve body 8 of the hydraulic valve. The displacement sensor 2 has a housing 20, which includes a body section 200 and a connecting section 201 with external threads. The displacement sensor 2 is threadedly connected to the end cap 1 via the connecting section 201. The locking nut 3 is threadedly connected to the connecting section 201 and is located between the body section 200 and the end cap 1. The locking nut 3 is configured to move to abut against the end cap 1 by a screwing action when the connecting section 201 is tightened to the end cap 1. That is, when the connecting section 201 is tightened to the end cap 1, the locking nut 3 can be screwed onto the end cap 1, improving the axial stability of the connecting section 201 relative to the end cap 1, reducing the impact of hydraulic valve vibration on the connection stability between the connecting section 201 and the end cap 1, and preventing the connecting section 201 from loosening relative to the end cap 1. This improves the measurement accuracy of displacement sensor 2 and enhances the operational reliability of the hydraulic valve.
[0034] In this embodiment, a through hole 10 is provided in the end cap 1, and the inner wall of the through hole 10 is provided with internal threads. The connecting segment 201 is fixedly connected to the internal threads on the inner wall of the through hole 10 through its external threads. By providing internal threads on the inner wall of the through hole 10, instead of directly providing a through threaded hole, when the connecting segment 201 is screwed into the through hole 10, the edge of the internal threads in the through hole 10 can be used to limit the connecting segment 201 from being screwed further into the through hole 10, thereby further improving the stability of the connecting segment 201 relative to the end cap 1 along the axial direction of the connecting segment 201. Furthermore, in this embodiment, the connecting segment 201 includes a first cylindrical segment 2010 formed in the body segment 200 and a second cylindrical segment 2011 formed in the first cylindrical segment 2010. The outer diameter of the second cylindrical section 2011 is smaller than that of the first cylindrical section 2010, and the two are coaxial. The external thread of the connecting section 201 is formed on the outside of the first cylindrical section 2010, and the connecting section 201 is threadedly connected to the through hole 10 through the first cylindrical section 2010. With the above structural arrangement, the second cylindrical section 2011 can directly extend into the part of the through hole 10 that is not internally threaded, avoiding collision between the second cylindrical section 2011 and the internal thread in the through hole 10.
[0035] Furthermore, combining Figure 3 As shown, in this embodiment, a first sealing structure is provided between the second cylindrical section 2011 and the inner wall of the perforation 10. The first sealing structure is used to prevent fluid inside the valve body 8 of the hydraulic valve from overflowing through the perforation 10. Combined with... Figure 4As shown, the end connection structure provided in this embodiment can be applied to a hydraulic valve, which includes a valve body 8. The valve body 8 has an inner cavity and a connecting hole that connects the inner cavity to the outside. The end cap 1 in this end connection structure is fixedly installed on the valve body 8 and seals the connecting hole. Specifically, in this embodiment, the outer surface of the end cap 1 is provided with an external thread, and the inner wall of the connecting hole is provided with an internal thread. The end cap 1 is fixedly connected to the internal thread on the inner wall of the connecting hole through its external thread. It is easy to understand that the inner cavity of the valve body 8 contains fluid and has a certain pressure. In this embodiment, the first sealing structure can prevent the fluid from overflowing through the perforation 10. It is easy to understand that a second sealing structure is also provided between the part of the end cap 1 that extends into the connecting hole and the inner wall of the connecting hole. The second sealing structure can prevent the fluid from overflowing through the connecting hole.
[0036] Combination Figure 2 and Figure 3 As shown, the first sealing structure in this embodiment has two locations. Specifically, the first sealing structure includes a first annular groove disposed on the inner wall of the perforation 10, a first sealing ring 4 disposed within the first annular groove, a second annular groove disposed on the second cylindrical section 2011, and a second sealing ring 5 disposed within the second annular groove. The first sealing ring 4 is clamped between the bottom wall of the first annular groove and the second cylindrical section 2011, and the second sealing ring 5 is clamped between the bottom wall of the second annular groove and the inner wall of the perforation 10. Furthermore, by providing the first sealing ring 4 and the second sealing ring 5, not only can the sealing performance between the connecting section 201 and the perforation 10 be improved, preventing fluid leakage inside the valve body 8, but the friction between the connecting section 201 and the perforation 10 can also be increased, thereby further preventing the connecting section 201 from loosening relative to the end cap 1.
[0037] In this embodiment, the second sealing structure has one specific feature: a third annular groove is provided on the part of the end cap 1 that extends into the connection hole, and a third sealing ring 9 is provided in the third annular groove. The third sealing ring 9 is clamped between the end cap 1 and the inner wall of the connection hole.
[0038] It is readily understood that in other alternative embodiments, the first sealing structure may also include only the first annular groove and the first sealing ring 4, or the first sealing structure may include only the second annular groove and the second sealing ring 5.
[0039] When assembling this end connection structure, first screw the locking nut 3 onto the first cylindrical section 2010. Then, screw the displacement sensor 2 with the locking nut 3 through the first cylindrical section 2010 into the through hole 10 of the end cap 1 until the predetermined connection depth is reached (the housing 20 of the displacement sensor 2 can no longer be screwed on). Finally, screw the locking nut 3 until it abuts against the end cap 1, ensuring that the displacement sensor 2 and the end cap 1 are locked and fixed.
[0040] Example 2: This example also provides an end connection structure for a hydraulic valve, such as... Figure 5 As shown, the difference between this embodiment and Embodiment 1 is that the end connection structure provided in this embodiment also includes an elastic washer 6 sleeved outside the connecting section 201, and the elastic washer 6 is located between the locking nut 3 and the end cap 1.
[0041] The elastic washer 6 can replenish the stress in time when the locking nut 3 experiences stress relaxation relative to the connecting section 201, preventing the locking nut 3 from loosening, and further improving the connection stability between the connecting section 201 and the end cap 1.
[0042] Example 3: This example also provides an end connection structure for a hydraulic valve, such as... Figure 6 As shown, the difference between this embodiment and Embodiment 1 is that the end connection structure provided in this embodiment also includes an elastic element 7 disposed between the body section 200 and the locking nut 3. The elastic element 7 applies pressure to the locking nut 3 so that the locking nut 3 tends to move closer to the end cover 1.
[0043] Similar to the elastic washer 6 set in Embodiment 2, in this embodiment, by setting the elastic element 7, stress can be replenished in time when the locking nut 3 experiences stress relaxation relative to the connecting section 201, preventing the locking nut 3 from loosening, and thus further improving the connection stability between the connecting section 201 and the end cap 1.
[0044] Specifically, in this embodiment, the elastic element 7 is a compression spring sleeved outside the connecting section 201, with both ends of the compression spring pressing against the main body and the locking nut 3 respectively.
[0045] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Those skilled in the art should understand that this application includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this application will be included within the scope of the claims.
Claims
1. An end connection structure for a hydraulic valve, characterized by, The end connecting structure comprises: an end cover (1) for fixedly mounting to a valve body (8) of the hydraulic valve; a displacement sensor (2) having a housing (20) comprising a body section (200) and a connecting section (201) provided with external threads, the displacement sensor (2) being threadedly connected to the end cover (1) through the connecting section (201); and a lock nut (3) threadedly connected with the connecting section (201) and located between the body section (200) and the end cover (1); wherein the lock nut (3) is configured to be moved to abut against the end cover (1) by a screwing action when the connecting section (201) is screwed to the end cover (1).
2. The end connection structure of claim 1, wherein The end cover (1) is provided with a through hole (10) having an inner wall portion provided with internal threads, and the connecting section (201) is fixedly connected with the internal threads on the inner wall of the through hole (10) through its external threads.
3. The end connection structure of claim 2, wherein The connecting section (201) comprises a first cylinder section (2010) formed on the body section (200) and a second cylinder section (2011) formed on the first cylinder section (2010), the second cylinder section (2011) having an outer diameter smaller than that of the first cylinder section (2010) and coaxial with the first cylinder section (2010). The external threads of the connecting section (201) are formed on the first cylinder section (2010), and the connecting section (201) is threadedly connected with the through hole (10) through the first cylinder section (2010).
4. The end connection structure of claim 3, wherein A first sealing structure is provided between the second cylinder section (2011) and the inner wall of the through hole (10), and is used to prevent the fluid inside the valve body (8) of the hydraulic valve from overflowing through the through hole (10).
5. The end connection structure of claim 4, wherein The first sealing structure comprises a first annular groove provided on the inner wall of the through hole (10) and a first sealing ring (4) provided in the first annular groove, the first sealing ring (4) being clamped between the bottom wall of the first annular groove and the second cylinder section (2011). The first sealing structure comprises a second annular groove provided on the second cylinder section (2011) and a second sealing ring (5) provided in the second annular groove, the second sealing ring (5) being clamped between the bottom wall of the second annular groove and the inner wall of the through hole (10).
6. The end connection structure according to any one of claims 1 to 5, wherein The end connecting structure further comprises a resilient washer (6) sleeved on the connecting section (201) and located between the lock nut (3) and the end cover (1).
7. The end connection structure according to any one of claims 1 to 5, wherein The end connecting structure further comprises a resilient member (7) provided between the body section (200) and the lock nut (3), the resilient member (7) pressing the lock nut (3) so that the lock nut (3) has a tendency to approach the end cover (1).
8. The end connection structure of claim 7, wherein The resilient member (7) is a compression spring sleeved on the connecting section (201), and the two ends of the compression spring are respectively abutted against the body section and the lock nut (3).
9. A hydraulic valve comprising a valve body (8) formed with an inner cavity and a connecting hole communicating the inner cavity with the outside, characterized in that, The hydraulic valve further comprises the end connection structure as claimed in any one of claims 1 to 8, wherein the end cover (1) is fixedly mounted to the valve body (8) and seals the connection hole.
10. The hydraulic valve of claim 9, wherein, An outer thread is provided on an outer surface of the end cover (1), an inner thread is provided on an inner wall of the connection hole, the end cover (1) is fixedly connected by the outer thread on the end cover (1) to the inner thread on the inner wall of the connection hole, and a third sealing ring (9) is provided between the portion of the end cover (1) that extends into the connection hole and the inner wall of the connection hole.